Signaling and indicating device for heating plants.



A. HEIN.

SIGNALING AND INDICATING DEVICE FOR HEATING PLANTS.

APPLICATION FILED MAY 12. 1913.

1,1 98,221. Patentedsept. 12,1916.

INVE NTOFr' ATTORNEYS ADOLF HEIN, OF BERLIN, GERMANY.

SIGNALING AND INDIGA'IING DEVICE FOR HEATING PLANTS.

Specification of Letters Patent.

Patented Sept. 12, 1916.

Original application filed April 11, 1912, Serial No. 690,211. Divided and this application filed May 12, 1913. Serial No. 767,228.

T 0 all whom it may concern Be it known that I, ADoLr HEIN, a subject of the King of Prussia, residing at No. 12 Zimmerstrasse, Berlin, Kingdom of Prussia, German Empire, have invented new and useful Improvements in Signaling and Indicating Devices for Heating Plants; and I do hereby declare the following to be a full, clear, and exact description of the same.

The present application is a division of my application, Serial No. 690,211, filed April 11, 1912, for Letters Patent of the United States of America.

My invention relates to improvements in signaling and indicating apparatus for heating plants, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a portable apparatus which may be placed in a room where observations are to be made, this apparatus indicating what the temperature is, and the time that the normal temperature is reached.

A further object of my invention is to provide a portable apparatus which is operated by an electric current with means for cutting off the current after the same has performed its work.

A further object of my invention is to provide a novel form of indicating and circuit breaking device for working in conjunction with the thermostat of a time piece.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claim.

My invention is illustrated in the accompanying drawings forming part of this application, in which- Figure 1 is a face view showing the various parts of the portable apparatus. Fig. 2 is a detail view of the time piece and means for stopping the same; and Fig. 3 is a sectional view through the indicating and circuit breaking device.

In this portable apparatus the arrangement is of such a kind that, as soon as a certain temperature is reached, an electric circuit is closed. As a consequence another part of the apparatus is so moved that the time measuring device, which in the drawing is shown in the form of an ordinary clock 25 driven by a spring is stopped. Of

course any other time measuring device may be used. All essential parts of the apparatus, that is the battery in the form of a dry cell 26, the heat measuring device in the form of a contact thermometer 27, a switch 28 adapted to stop the clock, and the clock 25 are provided on a common base plate 29. The current flows from one of the poles of the dry cell 26 over the wire 26 to the binding screw 30, which is insulated in the switch box 28, to the coil 32 of an electromagnet. The coil 32 of this electromagnet is in conductive connection with the bind ing screw 33, through which connection is made over the contacts 51 and 52 of an interrupting device 34 with the binding post 35 leading to the mercury 36 of the thermometer and thence by means of the contact secured to the binding post 37 through the wire 38 to the opposite terminal of the battery. As soon as the normal temperature is attained in the room in which the device is provided, the mercury 36 will close the circuit leading to the contact 37, from which the current returns to the second pole 38 of the dry cell. When the circuit is closed the electromagnet attracts its armature 39, which has a hook shaped end and extends through the opening 40 of the cover 41 of the switch box, and normally holds the flap 42 in the closed position (Fig. 1). When the armature is attracted the flap is released and springs under-the influence of the spring 43 into the open position shown in Fig. 3, which is determined by the flap striking against a stop 44. On the flap 42 is secured a pulling piece, such as a flexible wire or a small chain 45, which passes through an opening 46 in the casing of the clock 25 and is fastened to a spring 47 in the clock casing. As long as the flap 42 of the switch box is closed, the pulling piece is loose, and the spring 47 is in the position shown in dotted lines in Fig. 2. When the flap opens the pulling piece 45 becomes tight and pulls the spring 47 into the position shown in full lines in Fig. 2, the front end of the spring being pressed against the circumference of the balance 48, so that the clock will be stopped at once. The clock will show at what time the normal temperature has been attained in the room. The open flap 42, which, on opening, preferably discloses a disk 49 showing the attained temperature of 15, Will indicate that the desired temperature is obtained. In order to avoid waste of the electric current, in the event of this temperature being maintained in the room for a long time, so that the circuit is closed by the mercury 36 being in contact with the contact piece 37, provision should preferably be made for interrupting the circuit when the clockwork is stopped. For this purpose a further pulling piece 50 is shown connected to the flap 42 in the example illustrated, to which pulling device the contact plug 51 of the current interrupting device 52 is connected. As long as the flap is closed the two contact pieces of this device are connected by the plug. When the flap opens the plug is raised so that it does not come into contact with one of the contact pieces and the current is then interrupted. The arrangement of the switch box has been found to be of special advantage, because the opening flap furnishes a convenient means to stop the clock and interrupt the current. In resetting the apparatus, it is only necessary to pull down the flap 42 which brings the contact 51 in engagement with the contact 52, and also slackens the pull cord 45.

Copies of this patent may be obtained for WVhat I claim and desire to secure by Letters Patent of the United States is In an indicating and signaling mechanism, an electro-magnetic device having a hinged flap normally under spring tension, locking means connected with the armature of the electro-magnetic device for holding said flap in position, a source of current for said electro-niagnetic device, a thermometer for closing the circuit from said source of current through said electro-magnetic device, a switch carried by said electro-magnetic device, means connected with said flap for operating the switch to break the circuit, a clock, means for engaging the working mechanism of said clock for stopping the latter, and a flexible connection between said flap and said clock stopping means for actuating the latter on the movement of the flap.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

ADOLF HEIN.

Vitnesses:

HENRY HAsrER, WOLDEMAR HAUPT.

five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

